pow-powf-powl.md

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pow, powf, powl | Microsoft Docs		04/05/2018	cpp-standard-libraries	reference	powl pow powf	msvcrt.dll msvcr80.dll msvcr90.dll msvcr100.dll msvcr100_clr0400.dll msvcr110.dll msvcr110_clr0400.dll msvcr120.dll msvcr120_clr0400.dll ucrtbase.dll api-ms-win-crt-math-l1-1-0.dll	DLLExport	powl pow _powl powf	C++	exponential calculations powl function _powl function exponentiation powers, calculating calculating exponentials powf function pow function	e75c33ed-2e59-48b1-be40-81da917324f1	corob-msft	corob	cplusplus

pow, powf, powl

Calculates x raised to the power of y.

Syntax

double pow( double x, double y );
float powf( float x, float y );
long double powl( long double x, long double y );

double pow( double x, int y );  // C++ only
float pow( float x, float y );  // C++ only
float pow( float x, int y );  // C++ only
long double pow( long double x, long double y );  // C++ only
long double pow( long double x, int y );  // C++ only

Parameters

x
Base.

y
Exponent.

Return Value

Returns the value of x^y. No error message is printed on overflow or underflow.

Values of x and y	Return value of pow
x != 0.0 and y == 0.0	1
x == 0.0 and y == 0.0	1
x == 0.0 and y < 0	INF

Remarks

pow does not recognize integral floating-point values greater than 2⁶⁴ (for example, 1.0E100).

pow has an implementation that uses Streaming SIMD Extensions 2 (SSE2). For information and restrictions about using the SSE2 implementation, see _set_SSE2_enable.

Because C++ allows overloading, you can call any of the various overloads of pow. In a C program, pow always takes two double values and returns a double value.

The pow(int, int) overload is no longer available. If you use this overload, the compiler may emit C2668. To avoid this problem, cast the first parameter to double, float, or long double.

Requirements

Routine	Required header (C)	Required header (C++)
pow, powf, powl	<math.h>	<math.h> or <cmath>

For additional compatibility information, see Compatibility.

Example

// crt_pow.c

#include <math.h>
#include <stdio.h>

int main( void )
{
   double x = 2.0, y = 3.0, z;

   z = pow( x, y );
   printf( "%.1f to the power of %.1f is %.1f\n", x, y, z );
}

2.0 to the power of 3.0 is 8.0

See also

Floating-Point Support
exp, expf, expl
log, logf, log10, log10f
sqrt, sqrtf, sqrtl
_CIpow